h1 {
    font-family: "Open Sans", sans-serif;
    color: #444444;
    margin-bottom: 1rem;
    font-weight: 900;
    letter-spacing: 2px;
    text-shadow: 2px 2px 5px rgba(0,0,0,0.3);
  }
  form {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 2rem;
  }
  input[type="text"] {
    font-size: 1.25rem;
    padding: 0.5rem 1rem;
    border-radius: 3px;
    border: none;
    width: 450px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
  }
  button {
    font-size: 1.25rem;
    padding: 0.5rem 1rem;
    border-radius: 3px;
    border: none;
    background-color: #3194db;
    color: #fff;
    font-weight: 700;
    cursor: pointer;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
    transition: background-color 0.3s ease;
  }
  button:hover {
    background-color: #055ada;
  }
  #message {
    margin-bottom: 1rem;
    font-size: 1.1rem;
    min-height: 1.3em;
    text-align: center;
    font-weight: 600;
    text-shadow: 1px 1px 3px rgba(0,0,0,0.4);
  }
  #pdf-viewer {
    width: 90vw;
    max-width: 1000px;
    height: 650px;
    box-shadow: 0 8px 20px rgba(0,0,0,0.4);
    border-radius: 10px;
    border: 2px solid #fff;
  }
  footer {
    margin-top: auto;
    padding: 1rem 0;
    font-size: 0.9rem;
    opacity: 0.7;
  }
  @media (max-width: 600px) {
    input[type="text"] {
      width: 100%;
    }
    #pdf-viewer {
      height: 300px;
    }
  }